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Java > Open Source Codes > org > apache > xalan > xsltc > compiler > UnparsedEntityUriCall


1 /*
2  * Copyright 2001-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 /*
17  * $Id: UnparsedEntityUriCall.java,v 1.6 2004/02/16 22:25:10 minchau Exp $
18  */
19
20 package org.apache.xalan.xsltc.compiler;
21
22 import java.util.Vector JavaDoc;
23
24 import org.apache.bcel.generic.ConstantPoolGen;
25 import org.apache.bcel.generic.INVOKEINTERFACE;
26 import org.apache.bcel.generic.InstructionList;
27 import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
28 import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
29 import org.apache.xalan.xsltc.compiler.util.StringType;
30 import org.apache.xalan.xsltc.compiler.util.Type;
31 import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
32
33 /**
34  * @author Jacek Ambroziak
35  * @author Santiago Pericas-Geertsen
36  * @author Morten Jorgensen
37  */
38 final class UnparsedEntityUriCall extends FunctionCall {
39     private Expression _entity;
40
41     public UnparsedEntityUriCall(QName fname, Vector JavaDoc arguments) {
42         super(fname, arguments);
43         _entity = argument();
44     }
45
46     public Type typeCheck(SymbolTable stable) throws TypeCheckError {
47         final Type entity = _entity.typeCheck(stable);
48         if (entity instanceof StringType == false) {
49             _entity = new CastExpr(_entity, Type.String);
50         }
51         return _type = Type.String;
52     }
53     
54     public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
55         final ConstantPoolGen cpg = classGen.getConstantPool();
56         final InstructionList il = methodGen.getInstructionList();
57         // Feck the this pointer on the stack...
58 il.append(methodGen.loadDOM());
59         // ...then the entity name...
60 _entity.translate(classGen, methodGen);
61         // ...to get the URI from the DOM object.
62 il.append(new INVOKEINTERFACE(
63                          cpg.addInterfaceMethodref(DOM_INTF,
64                                                    GET_UNPARSED_ENTITY_URI,
65                                                    GET_UNPARSED_ENTITY_URI_SIG),
66                          2));
67     }
68 }
69
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